Passives

Common mode filters feature integrated ESD protection

11th December 2019
Lanna Cooper

Nexperia has announced a fast common mode filter (choke)/ESD protection combination. The new PCMFxUSB3BA/C features a wide differential passband of up to 10GHz 3dB frequency and a very high surge robustness of up to 7.5A 8/20µs. It is designed to suppress common mode and single-ended noise while minimising the impact on the signal integrity of extremely fast data lines.

Developed to meet the requirements of Super Speed USB applications, the new devices provide effective 1, 2 and 3 line pair protection (Tx +/-, Rx +/-, D +/-) and filtering. Proven for 10Gbps communications line protection, the filter’s system-level robustness exceeds the IEC 61000-4-2 level 4, suiting them for use with sensitive SoCs.

The solution also minimises reflections when compared to a discrete design. The integration of Nexperia’s TrEOS technology results in low clamping and high robustness. PCMFxUSB3BA/C extends Nexperia’s family of Common Mode Filters (PCMF devices), helping to optimise the choice between differential pass-band and common-mode rejection at signal fundamentals and higher harmonics.

Commented Stefan Seider, Product Manager, Nexperia: “Apart from their capability to reduce EMI, Common Mode Filters with ESD protection are also very popular for their efficiency in protecting sensitive transceivers: They add an impedance to the signal line pair, which is very small for differential signals but shows significant attenuation of common mode noise as well as single-ended transients such as ESD.”

The new PCMF filters are available in very low inductance, space-saving WLCSP packages. Devices are footprint-compatible with available ESD-only solutions for fast design changes.

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